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Submission #317435

# Submission time Handle Problem Language Result Execution time Memory
317435 2020-10-29T17:46:02 Z mohamedsobhi777 Parachute rings (IOI12_rings) C++14
37 / 100
 4000 ms 104168 KB 
#include <bits/stdc++.h>

using namespace std;
int N;
const int cn = 1e6;

vector<int> adj[cn];
int deg[cn];
int vis[cn];
int c;
bool bd = 1;
int del;
vector<int> vec;
set<int> th;
int asy = 1;
int cs = 0;

struct dsu
{
        int fat[cn];
        dsu()
        {
                memset(fat, 0, sizeof fat);
                for (int i = 0; i < cn; ++i)
                        fat[i] = i;
        }
        inline int find(int x) { return fat[x] = (x == fat[x] ? x : find(fat[x])); }
        inline bool same(int x, int y) { return find(x) == find(y); }
        void link(int u, int v)
        {
                u = find(u);
                v = find(v);
                if (fat[u] != v)
                        fat[u] = v;
        }
} d1;

void dfs(int x, int p)
{
        vis[x] = c;
        int ch = (p != x);
        vec.push_back(x);
        for (auto u : adj[x])
        {
                if (u == p || del == u)
                        continue;
                if (vis[u] == c)
                        bd = 0;
                else
                        dfs(u, x), ++ch;
        }
        if (ch > 2)
                bd = 0;
}
set<int> bigs;

bool check(int i)
{
        del = i;
        for (auto u : adj[i])
        {
                deg[u]--;
                deg[i]--;
        }
        bool ok = 1;
        vec.clear();
        for (int j = 0; j < N; ++j)
        {
                if (vis[j] != c && i != j)
                {
                        bd = 1;
                        dfs(j, j);
                        ok &= bd;
                }
        }

        for (auto u : adj[i])
        {
                deg[u]++;
                deg[i]++;
        }
        return ok;
}

vector<int> cyc;
vector<int> now;
int onc[cn];

void detect(int x, int p)
{
        if (vis[x] == c)
        {
                cyc = now;
                for (auto u : now)
                        onc[u] = 1;
                return;
        }
        now.push_back(x);

        vis[x] = c;
        for (auto u : adj[x])
        {
                if (u == p || (int)cyc.size())
                        continue;
                detect(u, x);
        }
        now.pop_back();
}

int brute()
{
        int ret = 0;
        set<int> uni;

        if (cs > 1 || bigs.size() > 1 || th.size() > 2)
                return 0;
        if (th.size() == 0 && asy)
                return N;
        if (cs == 1 && th.size() == 0)
                return (int)cyc.size();
        if (bigs.size())
        {
                if (asy)
                        return 1;
                return onc[*bigs.begin()];
        }

        if (th.size() == 1)
        {
                if (asy)
                        return 1 + (int)adj[*th.begin()].size();
                int tret = onc[*th.begin()];
                for (auto u : adj[*th.begin()])
                        tret += onc[u];
                //return tret;
        }
        else if (th.size() == 2)
        {
                int a = *th.begin();
                int b = *th.rbegin();
                //if (onc[a] + onc[b] == 0)
                  //      return 0;
        }

        if (th.size() > 1)
        {

                for (auto u : th)
                {
                        ++c;
                        if (check(u))
                                uni.insert(u);
                        for (auto v : adj[u])
                        {
                                ++c;
                                if (check(v))
                                        uni.insert(v);
                        }
                }
                return (int)uni.size();
        }
        if (th.size() == 0)
                return N;

        // if (asy)
        //       return N;
        for (int i = 0; i < N; ++i)
        {
                ++c;
                if (check(i))
                        ++ret;
        }

        return ret;
}

void Init(int N_)
{

        N = N_;
}
void Link(int A, int B)
{
        adj[A].push_back(B);
        adj[B].push_back(A);
        cs += (d1.same(A, B));
        if (d1.same(A, B) && asy)
        {
                ++c;
                detect(A, A);
                asy = 0;
        }

        d1.link(A, B);
        deg[A]++;
        deg[B]++;
        if (deg[A] > 3)
                bigs.insert(A);
        if (deg[B] > 3)
                bigs.insert(B);
        if (deg[A] == 3)
        {
                th.insert(A);
        }
        if (deg[B] == 3)
        {
                th.insert(B);
        }
}

int CountCritical()
{
        if (bigs.size() > 1)
                return 0;
        return brute();
        return N;
}

Compilation message

rings.cpp: In function 'int brute()':
rings.cpp:139:21: warning: unused variable 'a' [-Wunused-variable]
  139 |                 int a = *th.begin();
      |                     ^
rings.cpp:140:21: warning: unused variable 'b' [-Wunused-variable]
  140 |                 int b = *th.rbegin();
      |                     ^

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 27776 KB Output is correct
2 Correct 22 ms 27904 KB Output is correct
3 Correct 22 ms 27904 KB Output is correct
4 Correct 20 ms 27776 KB Output is correct
5 Correct 23 ms 28024 KB Output is correct
6 Correct 22 ms 28288 KB Output is correct
7 Correct 20 ms 27776 KB Output is correct
8 Correct 22 ms 27904 KB Output is correct
9 Correct 23 ms 28032 KB Output is correct
10 Correct 23 ms 28032 KB Output is correct

Subtask #2
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 474 ms 46200 KB Output is correct
2 Correct 962 ms 56092 KB Output is correct
3 Correct 1884 ms 79656 KB Output is correct
4 Correct 1212 ms 66168 KB Output is correct
5 Correct 1223 ms 72312 KB Output is correct
6 Correct 1333 ms 104168 KB Output is correct
7 Correct 1776 ms 80440 KB Output is correct
8 Correct 3030 ms 68964 KB Output is correct
9 Correct 3318 ms 72172 KB Output is correct
10 Correct 801 ms 65272 KB Output is correct

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 27776 KB Output is correct
2 Correct 22 ms 27904 KB Output is correct
3 Correct 22 ms 27904 KB Output is correct
4 Correct 20 ms 27776 KB Output is correct
5 Correct 23 ms 28024 KB Output is correct
6 Correct 22 ms 28288 KB Output is correct
7 Correct 20 ms 27776 KB Output is correct
8 Correct 22 ms 27904 KB Output is correct
9 Correct 23 ms 28032 KB Output is correct
10 Correct 23 ms 28032 KB Output is correct
11 Execution timed out 4073 ms 28032 KB Time limit exceeded
12 Halted 0 ms 0 KB -

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 27776 KB Output is correct
2 Correct 22 ms 27904 KB Output is correct
3 Correct 22 ms 27904 KB Output is correct
4 Correct 20 ms 27776 KB Output is correct
5 Correct 23 ms 28024 KB Output is correct
6 Correct 22 ms 28288 KB Output is correct
7 Correct 20 ms 27776 KB Output is correct
8 Correct 22 ms 27904 KB Output is correct
9 Correct 23 ms 28032 KB Output is correct
10 Correct 23 ms 28032 KB Output is correct
11 Execution timed out 4073 ms 28032 KB Time limit exceeded
12 Halted 0 ms 0 KB -

Subtask #5
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 27776 KB Output is correct
2 Correct 22 ms 27904 KB Output is correct
3 Correct 22 ms 27904 KB Output is correct
4 Correct 20 ms 27776 KB Output is correct
5 Correct 23 ms 28024 KB Output is correct
6 Correct 22 ms 28288 KB Output is correct
7 Correct 20 ms 27776 KB Output is correct
8 Correct 22 ms 27904 KB Output is correct
9 Correct 23 ms 28032 KB Output is correct
10 Correct 23 ms 28032 KB Output is correct
11 Correct 474 ms 46200 KB Output is correct
12 Correct 962 ms 56092 KB Output is correct
13 Correct 1884 ms 79656 KB Output is correct
14 Correct 1212 ms 66168 KB Output is correct
15 Correct 1223 ms 72312 KB Output is correct
16 Correct 1333 ms 104168 KB Output is correct
17 Correct 1776 ms 80440 KB Output is correct
18 Correct 3030 ms 68964 KB Output is correct
19 Correct 3318 ms 72172 KB Output is correct
20 Correct 801 ms 65272 KB Output is correct
21 Execution timed out 4073 ms 28032 KB Time limit exceeded
22 Halted 0 ms 0 KB -